Russia, Qatar discuss potential cooperation in energy sector / Russia, Tanzania have potential in energy cooperation -- minister / BRICS states aimed at expanding energy cooperation -- Kazan Declaration / Iran ready to expand energy cooperation with Russia, BRICS countries -- minister / Energy cooperation with Africa holds great prospects for Russia -- Foreign Ministry / BRICS countries intend to develop cooperation in energy sector -- joint statement / Energy cooperation with Russia is priority for Burkina Faso -- country's Foreign Minister / CIS countries adopt concept of cooperation in energy sector until 2035 -- Russian PM